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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ff5a7321dc4a865072f386bdb202684a71031bb1c25fe1e1cb72b59f4d24fb' 
  AND token = 'aLQkFc7cKLNBX2kx4bw7vgOYRc+ZRYfNF2BPowUUKI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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