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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45ff5eab8c5896a399464f60cab7b164dc8030f51edee205cab23b78b50da53' 
  AND token = 'Tu06u1vgrBcQ1h3nfVn6LGH5AnmpVFV4IRFF2vDzXTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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