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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e88d6c3e626b8b5da11fcbc45e50ec4b4bfabad6ce277e0d6d1af9e11fd8ef5' 
  AND token = 'vq2Le8FbVCESq/UD4K9P1U1iYx5ntFNjobK5v+BOBPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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