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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0aa81523d7b07485de6b27fa295edd02f3090938bcc1162df1c730b71bb82bb' 
  AND token = 'tAmY1eLSAw8TrLvxdc54Ai5bZ4TzbX/UFAkz6NnVlTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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