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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3eff29e7cbae5db34a284ac1da7874941c04b61e9a53bce9f17a1425bb710b2' 
  AND token = '0z9sqQer6FxzI9K2VPlB+M8IY8wsic4ouH0MhrzY/GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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