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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f432f4435f358c1b72572cc40a73c4cf4d3f50bc8ee60393c830de962dfb124e' 
  AND token = '4jQQVKnINUsYT5XXPKHo9wya/WE3vJ9oUvO1KfYHFlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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