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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81e498224f7e01161e861f8447ec7062f0f09dc084621bc812524de8a95908e' 
  AND token = 'Fl70T2GWUX8wKbotOypd8SyJjiiQFm2oqfW1d47yD6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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