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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642beca7ac1ab3ba6621a03071d30d2e988410c112f362fdc02db50f1dfb659b' 
  AND token = '2EUKECCGqCtwapXyoTnK2y21axUaTvu5VzEILAsyPSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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