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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fddd2d807d7bff00dc4f888c6bf958be4e57ce0ebf2aa4d32da8e6a0780e05e' 
  AND token = 'asvPXRTjmku3Ac3+g4G2qrsPS8ojGZUg1O1ncIbbZA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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