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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324da7da7318b800102ae8c11212675d0dffb6e7d346ffb7e5f4221c530695b2' 
  AND token = 'kLWiVLa+fuE9HUtAYcJIOy2Qd79in4T2GfCZFTGn3Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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