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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8c0e4350b4893882c82ffb661f3edc1f3828c95c05413127926b343b2c1feb' 
  AND token = 'byrf4jpL3XZNLdq9toSvLe8Ij5Kcru86Wyc3KqdeStg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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