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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dec6773488aaca50bb1259dac84d0734b8f886cbeac3d8fa6d463de4caaf4d9' 
  AND token = 'u4HEUq6nk0gQQ59ucF53s5Nt54LBjWl926Q4RnaZ6QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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