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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2079e1ef994b7bf998aac854ba3051c34273318cd072da51b87cedac2b4222b9' 
  AND token = 'HfT2AMnIFy4q1f88qGGtQviVzELUi+PS0fqMlsNQC3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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