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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6e794a59a035839b4aa12349d0ffef666334f006fe1fca9863f72e2d7a189c' 
  AND token = 'cQJLJBn29AX1/0sVhrW2K3mRb+n/cOQTPifJpE7VeWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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