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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe4f4a927efab0a84a237a1a71d1d251c13665b59a608ddae8665f27b0c268d' 
  AND token = '+6mJiPPC1LUZei1J5T/SigjBeo7teniBkp4mr0el8cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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