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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b287c308ca1f34ebf79c00b53a41dc74592884cd8a721b95786755dda8ab15bc' 
  AND token = 'CiLoCUqVHcHf6PfmdP/fMrhkUv7XA5XCWSTHj5j6AWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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