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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a20bf323b9777f9c5029b5e77736249aa2b271e8cbdd7c0cd0ca9d1f5e06e09' 
  AND token = 'HR150CIbQoZCNLPGCZCLVAqEthvPqPjGs3Ug3kp0K6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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