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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca4a8e8c1c6fcae515852477f76a3d7951651370c888a2f5878097b7ec70a93' 
  AND token = 'ZUqd6CaZ1O2G5AkO/M44TLnVZPa0/nz9bHi2hboUyoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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