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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a320069d01ce81c0fba75aa5811bb16a8823dc32fb15ce25bd81e3027f8ba88' 
  AND token = 'XRpG67al9vNv5tHB7fy32PHyoAaaf6fHFfWupe7wt6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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