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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4c66df4fbe8c0aa0ea498074c82e3172f296af2efb78d3168b74c403fe4cf6' 
  AND token = 'Z1rYbZh+PtbfhTE9fShUa5Iu7we8knsdDXtS6jrj9Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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