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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe757c3a0f6d3b70a6c3dab110f302ac863554a3c8918a823eb7f06a5c4ae644' 
  AND token = 'tgZV6zmlS/cJdH2bLrhAeAd0VO/8eBxzCx2gUANUXJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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