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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8a62c2a28fe049b74156c430350712692d881a9311a7ae4f8392a8f0b530f8' 
  AND token = 'GafpzeXbaPntwcPVN55Z8e44+Ldh5gHiNSKd7+Syc40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}