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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c452183bb62ce1d533db6e1dac1f3c4b4ba24b280d27910b1ea33407206af5' 
  AND token = '1V+62BTcQ4S2oSvnKClxVKmwqCCTZRE1XhIrqTCber4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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