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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3927a5ca9a98a099382cb805bada449c8c3530db90b76ba8a0b1eb0d0d2b884e' 
  AND token = 'tU48jRp5vz9VXf13wTF2waiobK9CgHY0MC95QiiExsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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