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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aec913682c9d24926787a388f086c4ad278360d7262b104a8940914cd4a8506' 
  AND token = 'mGAqN60YpSkEeC71Wx3+Xoc0gpCOszQi/qSIwJK6+RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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