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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5577a1819b085f4d24374f9ff31c588150dd0673479c6fd4cf95d6d3e59a3f50' 
  AND token = 'pV5S99gy/BoWqb+45Dvhs9Tr38GXEe3/7bdgF9OnKi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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