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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b046e65d0346ce8f14b2d1a86b55b1ea5dd7e3c98a1a6839b675ba31ba2c99f8' 
  AND token = 'EhaZuHSZ0tPrg9PhXVadTND1R9ejJFqZ8EpK6af6Y0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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