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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2b60bed284b88da3b615ce5767b04f250ff78b4491b3c5d82af6bd9583c39f' 
  AND token = 'F39MphTixb8hrM8DE7G5wLtmswh+b5h78NA1cYb/SRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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