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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37fa8e2c06b56a16854da5797cae5c21d2f9fe64fe611d1c0f39d40477c0d44' 
  AND token = 'Rlg9oWMpwi3htv/6UR4SK3mF/THwOFI/tbJ7LRH2uxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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