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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362fe71abe6b5ce63f621f28e62cff28b30812f7a37c3b75831356c2a1f8cf66' 
  AND token = 's1IerEk6fvGifOXJcyfvM9rNwkTs3Hadmgiv/g9P1Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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