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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcb81b8553dc89e5fc15c8a23f078e7ffb2080990b668bf76f8f64eb06fa09f' 
  AND token = 'A/G1UPJ/XY7GZam/8XRwu58f2qWI5hfKk5Zq2LeVFWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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