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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971b17a8f1261aaa79ffe8d3455809b85acbecd79376aa613ce57b29b611f5ba' 
  AND token = 'Or8ZQqVxlkyLZ4udMUgAQbj2/nMU5H9nH1Mwa/BbdyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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