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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7106472f348a4211a8f2ccd8079e1a803af9857c5d73ce971b56644fa8801cbc' 
  AND token = 'fA18R+eB6ADyLiu+KvXSWAOgLWTJEZ5STWMRfG6RXQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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