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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a5693ca7aa4ea1aa56966d9ec4e57739bcca73d957bd0fec2e1c64f9d81978' 
  AND token = '2zf2EiSzqQEpL+ReVMInY5T8Q3tSkwkZkuXk3xNXcF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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