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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc70ef0b09f1edd4f9d0da18584e05f6cee950a1c46d67c0260992004c13f998' 
  AND token = 'j9BWcKxPEpEVIi2Eq6u6MbZVLBISLHWLu3vG0sCy45E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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