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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af2a5c610e5115babede01882bb1bb94f6809bc0de91bf2593a9748d1fd6bf1' 
  AND token = 'M8XN5qkpuJu40olFDRWBnYQv/mGoSGnsJcpPIsGUjbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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