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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f217ca143a8f8a0ce5e8ef27d6ebafa54b60cb1f3037f7f830a573c1f3020639' 
  AND token = '1PSmDAkI45nj+YmN51dGxslrmK0UwqUEfyBU8bfpaQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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