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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54d112ba5b7eaf6814e5f9de1de9a9fa2e2b2a8fadd4b3b4a23e04a68906bcc' 
  AND token = 'MTc8vJgP8T09GXL1iYPySCQKCq+yz+nKIDSiwfLljNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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