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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62903d6205df60550dfe4010462fac505727ab3bfb03309b1313adee57a471e' 
  AND token = 'ZwOeSSC0G98fltf0QC+Onyh5Y7I+IV++m3ABOttR5C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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