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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5402d534bf85e23ce6795bc858bab9a36ece32b07ee29a1c4a6177cb3298ca' 
  AND token = 'XXzlmzZcKVJOUEA3z08Y4auz9JVCrs7bzOzhpSswfv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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